the reduction of a membrane potential to a less negative value. It is caused by the influx of cations, such as sodium and calcium, through ion channels in the membrane. In many neurons and muscle cells, depolarization may lead to an electric impulse called an action potential.
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South Beach Diet Phase 1 Foods. Â­Since the first phase is meant to curb your cravings for refined sugar and other bad carbs, the diet in this 14-day phase is quite limited.y stabilizing your blood sugar level, you'll curb your desire to eat those bad carbs [source: The South Beach Diet Online ]. Phase one foods are meant to fill you up, so you'll find a lot of protein-rich items on the allowed food list.